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v3.26.1

Long-Term Debt - Narrative (Details) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 24, 2025 USD ($) | Mar. 31, 2026 USD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Jul. 24, 2025 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |
Amortization of deferred charges |  | $ 497 | $ 486 | $ 489 |
Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of credit facility, accordion feature, limit increase | $ 125,000 |  |  |  |
Line of credit facility, accordion percentage | 100.00% |  |  |  | 100.00%
Consolidated leverage ratio | 3.50 |  |  |  | 3.50
Line of credit maximum quarterly increase | 0.50 |  |  |  | 0.50
Line of credit maximum quarterly increase |  | 1.25 |  |  |
Capacity available under credit facility |  | $ 94,287 |  |  |
Outstanding letters of credit |  | 1,013 |  |  |
U.S. Term Loan Facility | Thermon Manufacturing Company and US Subsidiaries (Guarantor) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Capital stock first lien assets, percentage | 100.00% |  |  |  | 100.00%
Capital stock first tier material foreign subsidiaries, percentage | 65.00% |  |  |  |
Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt issuance costs |  | $ 759 |  |  |
Variable Rate Term Loan due October 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable term loan, interest rate |  | 5.17% |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 115,000 |  |  |  | € 20,000,000
Long-term debt, term | 5 years |  |  |  | 5 years
Line of credit facility, unused capacity, commitment fee percentage | 0.25% |  |  |  |
Revolving Credit Facility | Line of Credit | Base Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 0.50% |  |  |  |
Revolving Credit Facility | Line of Credit | Canadian Prime Rate Loans |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 0.50% |  |  |  |
Revolving Credit Facility | Line of Credit | Canadian Overnight Repo Rate Average |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.50% |  |  |  |
Revolving Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.50% |  |  |  |
Revolving Credit Facility | Line of Credit | Euro Inter Bank Offered Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.50% |  |  |  |
Secured Debt | U.S. Term Loan Facility | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 125,000 |  |  |  |
Long-term debt, term | 5 years |  |  |  | 5 years

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